# Is a holographic recorder able to capture a large full color picture? [closed]

Is it practical to attempt to build a 3D hologram generator that is full color and big enough to recreate a watermelon full size? If so, is real-time control feasible?

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## closed as off topic by David Z♦Mar 27 '13 at 16:35

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Manufacturing production costings don't seem to be on-topic. –  RedGrittyBrick Mar 26 '13 at 15:18
Indeed, @RedGrittyBrick is correct. (In the future, if you see something that you think might be off topic, don't forget to flag it as such!) –  David Z Mar 27 '13 at 16:36
@gwentech Cost just seems to define an upper limit for building this device in industry. I see your question on topic. If you think so, please edit your question to remove the US dollar. –  Stefan Bischof Apr 9 '13 at 19:37
My thought is that this is asking about construction, not about a physical principle, and is still off topic. If it were asking something about the physics behind how holograms are produced, or about physical effects that might limit the size, then it'd be fine. Anyway, we'll see what other people think. –  David Z May 3 '13 at 3:04

## 1 Answer

Based on my one day lab practice experience, I will cover the general part of your question.

Color of hologram

Compared to a conventional photo a hologram additionaly saves phase (of light wave) information. Depending on the viewport the wave reconstruction allows the observer the experience color 3D pictures. However this reconstruction has a flaw: the color changes like a rainbow (color hologram on wiki) as can be seen in holograms on a credit card. Holograms demand the same wavelength for reconstruction than creation. I do not know whether there is a procedure to capture real color holograms using 3 capturing wavelengths, better than the above shown mice from wiki.

Cost of elements for a holographic recorder

Cost of elements for a hologram recorder: Using laser of long coherence length(depth of focus), stable mechanics and environment, beam splitter, beam expander, a photobox full o sand and holographic recording media, this is easiliy done below 30k dollar. Scale this up from my $5\cdot5\,$cm$^2$ using stronger beam expander. Your answer is yes but the question of the quality of the hologram remains. A proof is the initial linked picuture of a mice, that is small compared to a water melon.

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Thank you for your detailed reply! –  gwentech Mar 27 '13 at 1:47